Question: Silhouette special – SSS or HSS ?

I have just been lucky enough to test both a SSS and an HSS Silhouette special.

For some reason the SSS model is £300(about $400) cheaper than HSS.

I am a beginner and I struggled to tell the difference when playing basic chords, even when twiggling the lever all five ways.

Could anyone tell me why I should pay so much more for the HSS?

Thanks